Q12 (CDS-I/2026) Science & Technology › Basic Science (Physics, Chemistry, Biology)

Which one of the following gives the triple point of water?

Temperature 273·16 K and Pressure 1 Pa

Temperature 273·16 K and Pressure 6·11 x 10⁻³ Pa

Temperature 0 K and Pressure 10³ Pa

Temperature 373 K and Pressure 6·11 x 10⁻³ Pa

Result

Your answer: — · Correct: B

Explanation

The triple point of water is the unique temperature and pressure at which water coexists in thermodynamic equilibrium as a solid (ice), liquid, and gas (vapor). The internationally accepted values for this point are:

Temperature: Exactly 273.16 K (or 0.01 °C).
Pressure: 611.657 Pascals (approx. 6.11 millibars or 0.006 atm).

In the provided options, Option B correctly identifies the temperature as 273.16 K. Although the pressure unit in the prompt (6.11 x 10⁻³ Pa) is likely a typo for 6.11 x 10⁻³ bar (which equals 611 Pa) or 6.11 hPa, it is the only choice with the correct temperature. Option A lists 1 Pa (incorrect pressure), Option C refers to absolute zero (0 K), and Option D refers to the boiling point of water (373 K) at standard pressure.

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Which one of the following gives the triple point of water?

Explanation

SIMILAR QUESTIONS

Which one of the following is true for the flow of water from high level to low level (at constant temperature and pressure)?

Water at 273 K is less effective in cooling than ice at the same temperature. It is because :

At triple point the substance co-exists in 1. Liquid phase 2. Solid phase 3. Vapour phase Select the correct answer using the code given below:

Equal quantities (50 ml) of the following four samples of water are placed in four beakers of 100 ml capacity. Their boiling points are determined accurately using the same thermometer. Which sample of water will have the lowermost boiling point as compared to other three samples?

The absolute zero, i.e., temperature below which is not achievable, is about: